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Applications and Characteristics of Tungsten-Nickel-Iron Alloy
2026-02-02
Tungsten–nickel–iron alloys are important tungsten-based heavy alloys. They are composed of tungsten alloyed with nickel and iron, and may further incorporate other metallic elements. The typical nickel-to-iron ratio in these alloys is 7:3 or 1:1.
Tungsten–nickel–iron alloys are characterized by high sintered density, good strength and ductility, and moderate ferromagnetism. They exhibit excellent ductility and machinability, as well as superior thermal and electrical conductivity, and possess outstanding absorption capabilities for gamma rays and X-rays.
(1) High specific gravity: typically 16.5–18.75 g/cm³
(2) High strength: tensile strength of 700–1000 MPa
(3) Strong radiation absorption capability: 30–40% higher than that of lead.
(4) High thermal conductivity: The thermal conductivity of tungsten alloy is five times that of mold steel.
(5) Low coefficient of thermal expansion: only 1/2 to 1/3 that of iron or steel.
(6) Excellent electrical conductivity; due to its superior conductivity, it is widely used in the lighting and electric welding industries.
7) Excellent weldability and machinability
Tungsten–nickel–iron alloys are widely used; for general applications such as counterweights, balance weights, and radiation-shielding devices, sintered alloys are employed directly. However, when high mechanical properties are required, these alloys must undergo plastic deformation and heat treatment to achieve strengthening.
(1) Tungsten-nickel-iron alloys are primarily used in the manufacture of gyroscope rotors, guidance systems, and vibration-damping devices for aircraft and spacecraft.
(2) Die-casting molds, tool holders, boring bars, and balance weights for automatic watches used in mechanical manufacturing
(3) Armor-piercing bullet cores for conventional weapons, and rivet heads and switch contacts for electrical products.
(4) In addition, it is also used to manufacture various radiation-shielding components and other such parts.
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